30 lines
615 B
C
30 lines
615 B
C
#include <X11/Xlib.h>
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#include <stdio.h>
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int main(void) {
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Display* display = XOpenDisplay(NULL);
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if(!display) {
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printf("Error: Unable to open display.\n");
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return 1;
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}
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int screen = DefaultScreen(display);
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Window root = RootWindow(display, screen);
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/* SubstructureNotifyMask allows us to be notified of CreateNotify events */
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XSelectInput(display, root, SubstructureNotifyMask);
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XEvent event;
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for(;;) {
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XNextEvent(display, &event);
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if(event.type == CreateNotify) {
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/* print window id */
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printf("0x%x\n", event.xcreatewindow.window);
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break;
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}
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}
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XCloseDisplay(display);
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return 0;
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}
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